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53 lines
1.8 KiB
53 lines
1.8 KiB
/*
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* fs/sdcardfs/multiuser.h
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*
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* Copyright (c) 2013 Samsung Electronics Co. Ltd
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* Authors: Daeho Jeong, Woojoong Lee, Seunghwan Hyun,
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* Sunghwan Yun, Sungjong Seo
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*
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* This program has been developed as a stackable file system based on
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* the WrapFS which written by
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*
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* Copyright (c) 1998-2011 Erez Zadok
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* Copyright (c) 2009 Shrikar Archak
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* Copyright (c) 2003-2011 Stony Brook University
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* Copyright (c) 2003-2011 The Research Foundation of SUNY
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*
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* This file is dual licensed. It may be redistributed and/or modified
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* under the terms of the Apache 2.0 License OR version 2 of the GNU
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* General Public License.
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*/
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#define AID_USER_OFFSET 100000 /* offset for uid ranges for each user */
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#define AID_APP_START 10000 /* first app user */
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#define AID_APP_END 19999 /* last app user */
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#define AID_CACHE_GID_START 20000 /* start of gids for apps to mark cached data */
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#define AID_EXT_GID_START 30000 /* start of gids for apps to mark external data */
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#define AID_EXT_CACHE_GID_START 40000 /* start of gids for apps to mark external cached data */
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#define AID_EXT_CACHE_GID_END 49999 /* end of gids for apps to mark external cached data */
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#define AID_SHARED_GID_START 50000 /* start of gids for apps in each user to share */
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typedef uid_t userid_t;
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typedef uid_t appid_t;
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static inline uid_t multiuser_get_uid(userid_t user_id, appid_t app_id)
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{
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return (user_id * AID_USER_OFFSET) + (app_id % AID_USER_OFFSET);
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}
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static inline bool uid_is_app(uid_t uid)
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{
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appid_t appid = uid % AID_USER_OFFSET;
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return appid >= AID_APP_START && appid <= AID_APP_END;
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}
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static inline gid_t multiuser_get_ext_cache_gid(uid_t uid)
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{
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return uid - AID_APP_START + AID_EXT_CACHE_GID_START;
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}
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static inline gid_t multiuser_get_ext_gid(uid_t uid)
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{
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return uid - AID_APP_START + AID_EXT_GID_START;
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}
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